More than $13 million in U.S. funding for an international security force helping fight armed gangs in Haiti has been frozen under President Donald Trump's 90-day pause on foreign aid, the United Nations said on Tuesday.

The United Nations says that the U.S. has given notice that it is halting funding to a U.N.-backed mission in Haiti tasked with fighting gangs trying to seize full control of the country’s capital.

As hundreds of armed gang members, entrenched in the hills above Haiti’s capital, await orders to attack the last enclaves not currently under their control, the multinational fight to end their terror is being impeded by the Trump administration’s freeze on foreign aid.